Basic media tracks implementation for media stream parsers

media/base/media_tracks.h

Index: media/base/media_tracks.h
diff --git a/media/base/media_tracks.h b/media/base/media_tracks.h
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_BASE_MEDIA_TRACKS_H_
+#define MEDIA_BASE_MEDIA_TRACKS_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/base/media_export.h"
+#include "media/base/media_track.h"
+
+namespace media {
+
+class AudioDecoderConfig;
+class VideoDecoderConfig;
+
+class MEDIA_EXPORT MediaTracks {
+ public:
+  typedef std::vector<scoped_ptr<MediaTrack>> MediaTracksCollection;
+
+  MediaTracks();
+  ~MediaTracks();
+
+  // Callers need to ensure that track id is unique.
+  void AddAudioTrack(const AudioDecoderConfig& config,
+                     const std::string& id,
+                     const std::string& kind,
+                     const std::string& label,
+                     const std::string& language);
+  // Callers need to ensure that track id is unique.
+  void AddVideoTrack(const VideoDecoderConfig& config,
+                     const std::string& id,
+                     const std::string& kind,
+                     const std::string& label,
+                     const std::string& language);
+
+  const MediaTracksCollection& tracks() const { return tracks_; }
+
+  const AudioDecoderConfig& getAudioConfig(const std::string& id) const;
+  const VideoDecoderConfig& getVideoConfig(const std::string& id) const;
+
+  // TODO(servolk): These are temporary helpers useful until all code paths are
+  // converted to properly handle multiple media tracks.
+  const AudioDecoderConfig& getFirstAudioConfig() const;
+  const VideoDecoderConfig& getFirstVideoConfig() const;
+
+ private:
+  MediaTracksCollection tracks_;
+  std::map<std::string, AudioDecoderConfig> audio_configs_;
+  std::map<std::string, VideoDecoderConfig> video_configs_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaTracks);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MEDIA_TRACKS_H_